Low-voltage charge pump

A low-voltage charge pump, having a symmetrical structure, is proposed. In this charge pump, enhanced switches are used instead of diode-configured MOSTs. The switch-controlling voltage is mutually offered by the two symmetrical branches, which makes the enhanced switches turn on/off alternatively during the designated cycles. Consequently, the voltage drop due to the threshold voltage of MOSTs is eliminated, exhibiting gain in die area, rise time and maximum output voltage.